Send the device scale factor from Windows 8 ASH during initialization via the MetroViewerHostMsg_Se…

ash/test/test_metro_viewer_process_host.h

Index: ash/test/test_metro_viewer_process_host.h
diff --git a/ash/test/test_metro_viewer_process_host.h b/ash/test/test_metro_viewer_process_host.h
index 25a66e3d48570768dbeb51b3bed41a228bf1781e..f04ff0f0f3f902dbac355eebd8bc1d866c7e8fa6 100644
--- a/ash/test/test_metro_viewer_process_host.h
+++ b/ash/test/test_metro_viewer_process_host.h
@@ -23,7 +23,8 @@ class TestMetroViewerProcessHost : public win8::MetroViewerProcessHost {
  private:
   // win8::MetroViewerProcessHost implementation
   virtual void OnChannelError() OVERRIDE;
-  virtual void OnSetTargetSurface(gfx::NativeViewId target_surface) OVERRIDE;
+  virtual void OnSetTargetSurface(gfx::NativeViewId target_surface,
+                                  float device_scale) OVERRIDE;
   virtual void OnOpenURL(const base::string16& url) OVERRIDE;
   virtual void OnHandleSearchRequest(
       const base::string16& search_string) OVERRIDE;